Static protective relay

Details Static protective relay Static protective relay

1982-04-09

1984-07-03

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With phase sequence network analyzer

361 93, H02H 3253

Patent

active

044582838

ABSTRACT:
A static protective relay at least includes a plurality of current transformers inserted in poly-phase AC power lines, a half-wave rectifying circuit for rectifying the output voltages from said current transformers, wave-shaping circuits for wave-shaping two of the pulsate output voltages from the half-wave rectifying circuit into rectangular wave output voltages, and a negative phase failure detecting circuit including a data flip-flop for detecting the level of the rectangular wave output to be phase-retarded at the instant of rising up of the rectangular wave output to be phase-advanced.

REFERENCES:
patent: 3225256 (1965-12-01), Carter et al.
patent: 3431467 (1969-03-01), Calfee
patent: 3976919 (1976-08-01), Vandevier et al.
Electronics, pp. 106-106, vol. 48, No. 18, Sep. 4, 1975, "Phase Sequence Detector Trips Circuit Breaker", Malarkey; 361/76.

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